Major Waveforms - Casio AP-20 Service Manual

1
2
˜ ˜
CH1 .2V CH2 .2V
1 Filter output L-ch
2 Filter output R-ch
Tone : Piano 1
Key : A4
6
7
8
CH1 5V CH2 5V
6 Button scan signal KC0
7 Button scan signal KC1
8 Button scan signal KC2

MAJOR WAVEFORMS

A 1ms
CC connector pin 1
CC connector pin 2
A 2ms
CH2 5V
UPD65005GF-419 pin 53
UPD65005GF-419 pin 54
UPD65005GF-419 pin 55
3
CH1
4
5
CH2
˜
CH1 5V CH2 5V
3 Key scan signal KC0
4 Key scan signal KC1
5 Key scan signal KC2
CH1
CH2
CH3
— 12 —
A 20 µs
CH1
CH2
CH3
CH3 5V
JA connector pin 5
JA connector pin 4
JA connector pin 3